Different Edimax Linux source code?

I looked at this post from the Linux-MIPS mailing list archives yesterday. It's from September 2005. He talks about the file arch/mips/adm5120/memory.c and there are some lines of code. The memory.c file I have doesn't look anything like that one. Has anyone seen a memory.c file like that one for the adm5120?

I'm trying to get my router to boot and see all my RAM. Right now it only sees 16 MB out of 32. I guess that is the default number.

The AMiLDA Linux source is newer than 2.4.18 and it doesn't look like the posted code either. I also was not happy to see that apparently the ADM5120 linux code never made it into the "official" Linux-MIPS repository due to copyright questions.